/* SPDX-License-Identifier: GPL-2.0 */
/*
 * procfs namespace bits
 */
#ifndef _LINUX_PROC_NS_H
#define _LINUX_PROC_NS_H

#include <linux/nsfs.h>
#include <uapi/linux/nsfs.h>

struct pid_namespace;
struct nsset;
struct path;
struct task_struct;
struct inode;

struct proc_ns_operations {
        const char *name;
        const char *real_ns_name;
        struct ns_common *(*get)(struct task_struct *task);
        void (*put)(struct ns_common *ns);
        int (*install)(struct nsset *nsset, struct ns_common *ns);
        struct user_namespace *(*owner)(struct ns_common *ns);
        struct ns_common *(*get_parent)(struct ns_common *ns);
} __randomize_layout;

extern const struct proc_ns_operations netns_operations;
extern const struct proc_ns_operations utsns_operations;
extern const struct proc_ns_operations ipcns_operations;
extern const struct proc_ns_operations pidns_operations;
extern const struct proc_ns_operations pidns_for_children_operations;
extern const struct proc_ns_operations userns_operations;
extern const struct proc_ns_operations mntns_operations;
extern const struct proc_ns_operations cgroupns_operations;
extern const struct proc_ns_operations timens_operations;
extern const struct proc_ns_operations timens_for_children_operations;

/*
 * We always define these enumerators
 */
enum {
        PROC_IPC_INIT_INO       = IPC_NS_INIT_INO,
        PROC_UTS_INIT_INO       = UTS_NS_INIT_INO,
        PROC_USER_INIT_INO      = USER_NS_INIT_INO,
        PROC_PID_INIT_INO       = PID_NS_INIT_INO,
        PROC_CGROUP_INIT_INO    = CGROUP_NS_INIT_INO,
        PROC_TIME_INIT_INO      = TIME_NS_INIT_INO,
        PROC_NET_INIT_INO       = NET_NS_INIT_INO,
        PROC_MNT_INIT_INO       = MNT_NS_INIT_INO,
};

#ifdef CONFIG_PROC_FS

extern int proc_alloc_inum(unsigned int *pino);
extern void proc_free_inum(unsigned int inum);

#else /* CONFIG_PROC_FS */

static inline int proc_alloc_inum(unsigned int *inum)
{
        *inum = 1;
        return 0;
}
static inline void proc_free_inum(unsigned int inum) {}

#endif /* CONFIG_PROC_FS */

#define get_proc_ns(inode) ((struct ns_common *)(inode)->i_private)

#endif /* _LINUX_PROC_NS_H */